UPDATE: Paris Hiltonturned to Instagram Monday morning to react to Monty Brinson's death. Posting a collage of photos of him with their family, Paris captioned the pic, "Heartbroken to hear the sad news of my Uncle @MontyBrinson's passing after his long brave battle with cancer. He was such an incredible man with such a huge heart. He was so insightful & positive about life, even with all he was going through. He always had a smile on his face & lit up the room with his positive energy & fun personality. He will be truly missed. My thoughts & prayers are with @BrookeWiederhorn @KimRichards11 & his family. #RIPMontyBrinson"

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Monty Brinson's battle with cancer has come to a sad ending.

After sharing several poignant messages on Instagram in recent days, Kim Richards' ex-husband has passed away at the age of 58.

"We have lost Monty Brinson after a brave battle with cancer," Rick Hiltonannounced on Instagram Sunday evening. "His heart was as big as the moon and he was loved by all he met."

Kathy Hilton's husband added, "He will be sorely missed. I love you always!"

In the days leading up to his death, Monty kept fans updated on his condition while also sharing a sense of optimism that he would be alright no matter what happens.

"Even though I'm facing death eye to eye which instead of being scared or pity, I'm embracing it as I go forward with this journey," he shared on Instagram. "I pray my journey helps others in what lays ahead of them through their struggles."

Kim also appeared to share that same positive attitude when she posted a tweet for fans before the weekend.

Although they were only married from 1985 to 1988, fans of Real Housewives of Beverly Hills knew the couple remained close. In fact, the pair never missed out on important milestones and family events.

"Always know your in My Heart. I love you so much. We have come so far, let's keep it going," Kim wrote after celebrating Monty's most recent birthday. "I'm right by your side forever!"

As the family begins the grieving process, perhaps those close to Monty will find strength in the gratitude he expressed for everyone in his life.

"I'd like to thank all the people who have crossed my path," Monty shared in one of his final posts. "You've all touched my heart. May everyone have a blessed night and much love to everyone sweet dreams Monty."

Our thoughts and prayers go out to the entire family during this difficult time.